Vertical Battery Grip for Nikon D3100 EN-EL14 Battery
The Canon Rebel T2i / 550D Battery Grip is both powerful and versatile. Doubling the amount of shots that these SLR cameras can take on a single charge, the Power 550D Battery Grip also offers the flexibility of a secondary shutter release button for vertical shooting.http://www.linkdelight.com/B8O-Vertical-Battery-Grip-for-Nikon-D3100-EN-EL14-Battery.html